Create fuchsia-fyi-arm64-emu-arg builder to test the emulator argument changes

The builder itself is temporary to test emulator argument changes
against arm64 bots. The same arguments can be applied to x64 if they
show positive results.

(zijiehe: this change is on kir)

Bug: 1319561
Change-Id: I1524645ed1d422f6161c0282f517df8712f6a865
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3601423
Reviewed-by: Chong Gu <chonggu@google.com>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Zijie He <zijiehe@google.com>
Cr-Commit-Position: refs/heads/main@{#996242}